I've been asked by a couple of people to describe my job function at Microsoft.
Fair question.

I'm an E-Business Product Technology Specialist for Microsoft, in the Sales group, primarily involved in Technical Pre-Sales opportunities.  I specialize in the E-Business Server products, MS Content Management Server, MS Commerce Server, and MS Biztalk Server. I visit customers with Account Managers, and on my own, answering technical questions about the products, helping with product evaluations, etc.

It's a great gig, and I'm enjoying it.  Prior to this place, I worked in the same function for BroadVision, an E-Commerce software solution.  Once BroadVision needed to shut down its Seattle operations, I pretty much needed to find work, and Microsoft was local and needed some help.  I've been here almost a year now, and am enjoying it very much.